ABSTRACT:
Due to various nonideal
factors, including the motor parameter mismatches, detection errors, converter nonlinearities,
noise, etc. DC bias and high order harmonics exist in flux model, which make
the traditional flux observer estimation inaccurate. In order to suppress DC
bias and high order harmonics, an interior permanent magnet synchronous motors
(IPMSM) sensorless drive method based on a fifth order flux observer (FOFO) is proposed
in this paper. The proposed FOFO can completely remove DC bias and has strong
filtering ability for high order harmonics. Additionally, the parameters of the
FOFO are set through s-domain analysis. Then, the discrete FOFO is
obtained to better implementation in digital systems. The proposed FOFO is
verified by experiments on a 2.0-kW IPMSM drive platform.
KEYWORDS:
1.
Interior
permanent magnet synchronous motors
2.
Fifth order flux observer
3.
Sensorless
drive
4.
DC bias
5.
High order
harmonics
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.
1. The block diagram of IPMSM sensorless drive based on the FOFO.
EXPECTED SIMULATION RESULTS:
Fig.
2. Estimated rotor flux and position estimation error at 1000 r/min. (a) SOFO.
(b) FOFO.
Fig.
3. Eestimated rotor flux and position estimation error at 1800 r/min. (a) SOFO.
(b) FOFO.
Fig.
4. Estimated rotor flux and position estimation error at 50 r/min. (a) SOFO.
(b) FOFO.
CONCLUSION:
In
this paper, to further improve the performance of the flux observer to suppress
DC bias and high order harmonics, a FOFO is proposed. Theoretical analysis
shows that proposed FOFO has strong attenuation ability against the DC bias and
harmonics, and motor parameters mismatch and additional interference can be
avoided. Additionally, the parameters of FOFO are set through s-domain
analysis. Moreover, for better implementation in digital systems, the structure
of discrete FOFO is obtained. The effectiveness of the proposed FOFO has been
verified at a 2.0-kW IPMSM sensorless drive. Compared with the SOFO sensorless
drive, the proposed FOFO method has strong performance of suppressing stator
voltage DC bias and stator current DC bias, and the proposed method has better suppression
of stator resistance mismatch and q-axis inductance mismatch under the
condition of stator current DC bias. The main advantages of the proposed FOFO
are: 1) it is insensitive to DC bias; 2) it has strong suppression ability to high
order harmonics; 3) it has high rotor position estimation accuracy. Our future
research work will further study the application of FOFO in synchronous
reluctance motors.
REFERENCES:
[1]
S. Kim, J. Im, E. Song, and R. Kim, “A new rotor position estimation method of
IPMSM using all-pass filter on high-frequency rotating voltage signal
injection,” IEEE Trans. Ind. Electron., vol. 63, no. 10, pp. 6499-6509,
Oct. 2016.
[2]
H, Zhang, W. Liu, Z. Chen, S. Mao, T. Meng, J. Peng, and N. Jiao, “A time-delay
compensation method for IPMSM hybrid sensorless drives in rail transit
applications,” IEEE Trans. Ind. Electron., vol.66, no. 9, pp. 6715-6726,
Sept. 2019.
[3]
R. Antonello, L. Ortombina, F. Tinazzi, and M. Zigliotto, “Enhanced low-speed
operations for sensorless anisotropic PM synchronous motor drives by a modified
back-EKF observer,” IEEE Trans. Ind. Electron., vol. 65, no. 4, pp.
3069-3076, Apr. 2018.
[4]
C. Li, G.Wang, G. Zhang, N. Zhao, and D. Xu, “Adaptive pseudorandom high-frequency
square-wave voltage injection based sensorless control for SynRM drives,” IEEE
Trans. Power Electron., vol. 36, no. 3, pp. 3200-3210, Mar. 2021.
[5]
G. Zhang, G. Wang, H. Zhang, H. Wang, G. Bi, X. Zhang, and D. Xu, “Pseudo-random-frequency
sinusoidal injection for position sensorless IPMSM drives considering sample
and hold effect,” IEEE Trans. Power Electron., vol. 34, no. 10, pp.
9929-9941, Oct. 2019.
